An embedded color wheel appears to extinguish when observers fix their eyes on the cross.pic.twitter.com/6BWmWl8KKG
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A color wheel appears to extinguish when observers look at the cross.pic.twitter.com/uVlgQjNXhC
A gray ring appears to extinguish when observers fixate at the cross.pic.twitter.com/G7mqQ3s2Z1
近くからみると、サークルを四角にみえてしまいます
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